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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd96fd3311b476eec4af7ec0d35b0b871d3e446103b9a87036644f7f9f1ec039' 
  AND token = 'mGIqDJszjAk1r7WuSNEpDWV5kxh1cRUuKltmpu7b0Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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