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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bceb53d33aa78e4f1fa82a360ae4e0884fcf7940166f8f0114188a70839599e' 
  AND token = 'czVp4vzpqHHg2RLzMPi1ampLCjIm+xDNyDuLrZVz01w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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