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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ca9271be3aad1e3f2172c1c6df6b7cbc6230f74e43a6b86d855f5ba1ef4b3f' 
  AND token = 'yhgpWlft4D6Xq0fcF5VCNRZv64y+LKK3MeBgwMnrd6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}