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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60bbe370438eff0d64654a87f086ebe75298d5109684fa240287cda98f51c19' 
  AND token = 'OoRYax9uV0XReJSxfBmxHe6cjw/9/9Cn6V0I+fXcI4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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