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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55deafa6d618c748a834b69d89f96ef2966b11b3f7cc0c10818b8f4a8f1b0f8b' 
  AND token = 'nnThnFUmxvL0DMEttsF50x1sPNM3B/Cyglb3F4Npuec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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