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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '844752e66e8dd7d90d797481b12202aa977f88d65d35a1d7287575388e1682c2' 
  AND token = 'VA1nQMY/9i4Ck10/BKeGZNhg+uuR6C90VQtzJGazf8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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