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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a862c39238240fb1dcf102306632f67cf077ccb3e5dc71c1f57444f3133fff7e' 
  AND token = '/QN9lE1FnoAJu1stOMgHCSn9Z4s0iRBeu1xuOTE4/7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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