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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd749e2be97438442718e4b45b8cd357d76ecafc9fdfb5d3ccb09d3f23df672a1' 
  AND token = 'eyv/TGVdsbwL1FBvWE06Hraji/VhSPyq0yuOa03xiic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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