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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204a415dc361fd022e4ffa8ba6f18b29354a739ec4a29fc5362994da7c8379b8' 
  AND token = 'GCZDnicQ4zAXbQ3cvpOvYiX8mkT7Sv0TrvHwrRDcJHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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