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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3741e1768a062be1e9a1e8cb182483d269c8d549c6eaa25904e4c71f07869172' 
  AND token = 'gdnItbV4UH1jCItK1+tkGrY+AkgunX68joLy1ZD4xJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00130

JSON explain

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