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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dbf06f691aea13bdc160f6f7b2189d72a3a131f35ca87d02664e60ba787716c' 
  AND token = 'GsdbQ02sip2IQc8F84PTYZdzd5NCKf0nxgzy57TCq1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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