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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '496654772c61b638be59870d0ba23b3446f1e64aed71ef076d90fa27a2a742ac' 
  AND token = 'kHHf7CO07mu+caojX393Ekde+dpqVh9xISXZnKKu9Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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