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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de26d859db3541da26a636b2933042fb872b9574cbf7924528a3a7a7b366a8d6' 
  AND token = '1rZb/hN8yLqA9/x7aN9DbGASNfTRz+Gae6FWIv/atNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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