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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b962b19ceaaa3c35cec926db4486bd42735bdd5b066b8e436b786a7e14860dba' 
  AND token = 'YR44p8+G8dK3K2oW8R86X+hBjouRXDyg2gcKGMF3OpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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