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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25aef58f66e5fcd82fa48f4a14dd7008d2aa6a71ffbb75b3882f973d8a3b4ead' 
  AND token = 'ivP6l06W6mc9BlRg7O8qMHDZ6I+RBDgI7c2a0h3BUlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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