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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb010fe47770244db9bb323639838fc743fc6f77d26dd09195b7d952b80554d4' 
  AND token = 'TRex/Es0IJZmfAs7SimHk5SDwh4IoECmUIoiJzd/vNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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