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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b2fb2bdeb12198bf907a49e69da0ff56804b34f6c0b40ca630424232dc7184d' 
  AND token = 'XZxIblNC5/A5//BF23ND4HLPmcfL27paGrHZQyFH164=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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