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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca589d777562e62d6545d01b3d1b04f2ed04a6d8d744df28832e3467e8ff784a' 
  AND token = '9nFp5TvM5GtvxQJj6xcjNtnkLv4Jb0ZagwAshf3PuCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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