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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5abde6f01eddad7733a778775ea0c15b9d48b242c685a96267ae56f32e5630e7' 
  AND token = '19yJE8yc2YERKLZiWaLQ4LU5FFdvVFLbkdkR5heJRp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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