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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '890ecd7b35341394e819d5923b26b128ff07aa6c65fba6eba5929a6df391e4c2' 
  AND token = '0e1aKSttM81ZzY0eoC6aUS/jbq5qrIyYIoh7rqJm8iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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