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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd6c5bc474b2afa16bba6509e7bb8d58e7e930e7190fcb6af8c3498c1af3073' 
  AND token = 'o3Kab7/lB86vJMaC6wb62DUZ7lg1LyfwEiMpBfj7tOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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