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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f766961254beb4070a28dc8e504037ae79b37e0ded39895334651250c9f2b5' 
  AND token = 'smTTZMWToFUjjGcNCKzXoWiG4yzcJtu9aNqgqciNjQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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