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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f61c52151470a1a95df35658f255ba74defd62faf39451f2d70494c401f465' 
  AND token = 'yQ7MIkVsx+ylDsrjunLkX8RZkj2rLh745oLUnUJFGnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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