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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca977c434c2f0facd986e1093793b20b382ba9bce3add2ac68aa97a744f683b0' 
  AND token = 'Y7hi7XBGhV9BGlWGZAb4SH38pbGQdWd9J5x8T57KBWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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