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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61b996a04975597cdb13f6a43c0a9361dd48047432010c28d6430a51f26f6f0' 
  AND token = 'RMmROV3zd2kJVbhEAxQWdMiB670ji6oCqBa/DAUXFf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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