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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19b4df5e19aa3bd1e4ef7810e2c2cc2feab2042ebe40e486a79e06c40b6202c' 
  AND token = 'v2jUKDWx5iHKPUP5u4zQZtfuUvE3W1FUKfn02jDNsVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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