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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b8f2d562d5f944ba0306af32b9a3adfc09c7509947fdd6b026f33f02f58aad9' 
  AND token = 'VGq4XPECSxJb43Y8MabdPQd2ej/qwp53kZnycaVYq1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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