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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce7f26439f26bc819297337aeb8b92d1d21d03a53d4ee7cf09c041d79b2b9156' 
  AND token = 'jnevwNluspF2LuXow56Ha0LRj4fCouerUX5XAm9Rjnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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