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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee65882bb98fda96c92f937520e4b00fea4416c3aab0edc790c1321c716f929c' 
  AND token = 'Al43/oD9wNH+jDCbccrIaqKiwujLlJsAzk0Vi49iMIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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