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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c33e0f8ded1d33a30d4158609d59a5d28f362894a767dd63a712197c6336c34' 
  AND token = 'ePQo5iP6ifj0vbNu/56OjFmZ2qBWsq/shrsEwDIUL5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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