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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4792d74d5079c72c882fafcacf725ddb158e3f3604c95a7ea95b402dee115f' 
  AND token = '59Sb/bGlayNAjh10hEpY8SaHf56Hh7lgRHRasqv02n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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