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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e30bf9bfcc6bceab51823da005ae924cc12f25f14b477a95fb33b6c6091deb3' 
  AND token = 'M3Wg1X99vE8zplAq9bKPQRyMObk24BlWa+uqHtbOV3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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