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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be4d38a21481ea4d62a776778242c3baeb071bf7a1f92306fad0cf8a424ef93c' 
  AND token = 'dN2FI2qDu5NmM5Qss92dN45WMYaL7qIdJ3YGWg3hC7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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