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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ea9f209bc0c94c0d31e6ce71319d53312aa57361d7ab1172917c5be7c0d645' 
  AND token = '3zGPyG3feZjNhOu57kxY3kHnIgqcqrGwtP53UiVCKgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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