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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb666333e2ac3300c404876b819b56a2839e424ad1a25dea6eae621435e2d79' 
  AND token = 'EbTPtbY41dKfEyM8S6Et6B9z/sYLI6Ab+fov1MHFowc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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