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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b76fc5455f136d35f9baa975395cce68b206f04ae25f58f98f3ee7a0ea1a2882' 
  AND token = 'DUD8cY9OYL8VFwKO5rHfWY8Z0DbV7gaOQkLuIaWWsso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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