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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eda17812953185316fe86c9b745008616de4cf88191f6b3131ac232284d23f4' 
  AND token = 'eabO+m5o749EL9HqKVOmr4+TwnCb+PNE+NvYfd8qU+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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