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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68699334090409d222043b8cb49062eae3609451a82b1f937bb1104bf9156f90' 
  AND token = 'GLGDfrr6058BZnodKpN6UrW42BlHYrEKkR6mI9ctmKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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