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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1407b3bb0c4f6ba82b9d23fc382d83d1d08dd2674e6e0c83818461d1e62014f' 
  AND token = 'uFH2AenMoUE6RfcNEvc23zSdBRcEKabm377+5WxHe5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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