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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca05a4a6678e550912ca5e339712ec3eae28c5a5ccc273759c08f0d4507227d' 
  AND token = 'fQOw7O3ZuKzypvtZYoZ2E+7jL/rjgULzFECAeFbkvHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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