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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8228ec5ff85df92432c90b3d097c475091cbdae16d159e22f9f3b8b09f5a9784' 
  AND token = 's/1/CT1IyG0wfhWRRAbnDA/x4Lik0SdglsbLVg3Xnk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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