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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a7f3b3f0c53a41be3eaf8bfb57c1c86cc476276a9b97cec952acbc1d400ad2' 
  AND token = 'WbSEw5bw19lSgO/+gdK9v3HPJrjMhE8ikUv9jfonzr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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