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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b822bad33d0bb10cfbd8dea79d76d578ffdde1e5862b7ea9aa605d98d3a6b4' 
  AND token = 'm4QY4Jfu0pnoAk4/BT91KWAMDh+uExcrF/qnJVr4Omw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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