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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9012cc846f723a34bc12f13d312b69122890441f210a851149d1dfbc79785ab1' 
  AND token = 'rELKPiZh3wWbAFwOEuol1E3stH1rkNlIlxiH1CScCqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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