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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a456416518a9f6e8379dc32eee708877346f0cd7e1048f73996ad4ad76d05c' 
  AND token = 'v2tY0jaBXxaB9G/p8Hr0Ye77KQcbyPLHphOs4tkMkxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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