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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b67c1bd02efdccf5950b64c70ebaa1ad15bef3c30854014cb2bd7aa4eac750' 
  AND token = 'veXkPfVsp9FusCbiJZHT7Zc24YihsB6yjaCJHOLlQzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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