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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db531c8d4ca8ce790b2bacffcadbe5e45ec3b8fa75fa8ba910a771a1a5ad019' 
  AND token = 'wbNa+RzGQgKhu5+k+F29h4UlNYS1cLMpDdwmqmsH7L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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