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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4820873265650e2d30b6e47a1276558e9629858d7536339c4ef64c29a6f1301e' 
  AND token = 'zhmafeX4lLEtZuw7iRqHRY4fwytjCsOuC4l/icIA89w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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