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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63ce66b178780671e301e55c5745c1b597986eec96ff4a7f5f2cedb7293364b' 
  AND token = '1oGeeMkoBQ2OSeQJGAqKHyKnWzXnqnXDVQDdKZME0Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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