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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d54fa457ea12adb1f1c9ac3551a2121de97364a4b2cfbdf4fdeb41addfb65c' 
  AND token = 'LPyM+c2BUr4W4uWlabm1l1ZcWq8qyvYINH/6gV1XlBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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