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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc3f37d9bf9e23c112b95a0cbe475b66faa9e5d1f7ca21dd6a6fb413c868978' 
  AND token = 'JQEb2v2eTD9lzI2m7eTRo1Blj0AS6LU9+G3vC8f6zec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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