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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f3b792ee70a22093237e1dc02e097a5bc2bec8e11be61baf942931c87298a3' 
  AND token = 'hWv1R1hTScbIZBH2dXsVjNMqzUwLnxFzkFd8/l4c2pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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