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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc5cc4f91317eae3d5c26a744c0b468fbc6706b7bf06582b35ae350b6fc983f' 
  AND token = 'sAEf3CVLUvfnMq12onJEYvehfo5XtODSAx1p1ssWbIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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