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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd108cc23c164174e808d85698eb0dd93a2926b74cf1c202c9b7ddf669ae8d5a' 
  AND token = 'WjkV2cAmOeyplNP76bdhYOZ7WKyH4gf7+RIvyXAXazg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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