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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f38f75efc2909a37904cd8f825a644982c3840c9bd6e64c2e64e1eba0f07ac' 
  AND token = 'wCJYyBaG9oyFWBdo6avCb7DvkEeWuViW5Eu2jURy14k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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