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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c24c2d7cb904b4be981d628228d1ad7c459c5d86414f7b1ccab23a0ad9c060' 
  AND token = 'evWoCxA/CCF8lTfZaGmTXFlmOZSB3cdH7d6WIapR11M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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