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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21dbeb10face653940cd0ca9134e67107f5ea2de3acba1f53776f8d27e90958a' 
  AND token = 'qOHernEos0JYQ3Qw2g6IeszvHNqW3xdgDjNd/rdbRkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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