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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e13909efff9aed45b6312c737a5c513cea526acb1705fbe8be7c5c8fd6fa05' 
  AND token = '/bHdCp2FFYSKRR85tcDBNETara7d1j8Z4FMG3JltHM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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