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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ea1b4df321d8651ea53047837a5b39d1d3b6f447e7dcd8d4c2e384a89dd1af' 
  AND token = 'SdFYtIWfvSAAus2cDgUojTd8JS97WKrQ/lluajqJV+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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