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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c522fc41f1d7200de61e8bdfdef50c471b66f41a0122320ddde6fd6c1a7cf178' 
  AND token = '/ASrnJp2WInDyK96TSWwtKHVMaamfRT14xp7K59w2ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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