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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce6067da8e62b7d02fa94049e94dd193d89a1cef10c2d3020ac1474b770de7be' 
  AND token = 'BPoR0aDDY/UcvIwApo73e55JE2dSiiPj0XH/ySt+e6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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