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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4893be4bd2196c73810e0f287b50bfdc8d21b60686867ce5df2fcc2f03b84e9' 
  AND token = 'rIflQ9yn5bO6k3iQZrzpYZRgi8GSTjOMSu7ds/EJOYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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