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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee05ea1935cd5cf31e7843742a0606881de359123b0d8cf472f2185758c08e70' 
  AND token = 'V9tDxhPUhcjOFr+sv/SvvCpMp8sI1DfGJamHvNfnE/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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