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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1893917b804286a0b6c7fb7f1dd38b2b698ff35866d4e573979b7c0f3a491ae' 
  AND token = 'DDPxs2zQZQ9dozZXA7Y/mfsKQJb1PZxQY/bqPxtmmeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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