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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3fd60c37a5b7fe27407a0f12389f9b93fedfec046f587f42a3e986b94f580f4' 
  AND token = '7tcBih2oHuswBEKVCBIK7INcSJ8M/z+CrQHO42d9Icc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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