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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c54f9dde12a19c6e97a3e8ba740f89c8963c091b4ee7d57ab3f29a5fc3b9e64' 
  AND token = 'q7if625HP0dmIUQM6XT9hgd4ZSNb4APPlug8VIzvBi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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